The melting point of ice is 0°C. The melting point of a solid is the same as the freezing point of the liquid. At that temperature, the solid and liquid states of the substance are in equilibrium. For water, this equilibrium occurs at 0°C.

The melting point of a substance is identical to its freezing point. The two differ only in the temperature direction from which the phase change is approached. The melting point at 1 atm is the normal melting point.

32 °F.

A substance (solid) containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures and is called the “melting point depression.” In general, the smaller the range of melting temperatures, the higher the purity of the sample.

There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid. The reverse of the melting process is called freezing. Liquid water freezes and becomes solid ice when the molecules lose energy.

The temperature at which a solid melts is known as the melting point (MP) of that substance. The melting point is a physical property of a solid and can be used to help identify a substance. In practice, a solid usually melts over a range of temperatures rather than at one specific temperature.

The presence of even a small amount of impurity will lower a compound’s melting point by a few degrees and broaden the melting point temperature range. Because the impurity causes defects in the crystalline lattice, it is easier to overcome the intermolecular interactions between the molecules.

The determination of melting points is one of the oldest identification and test methods for organic substances. The melting point is easy to measure, tabulate and classify. Extensive collections of tables give the exact values of many pure, inorganic and organic compounds.

Water freezes at the same temperature and turns into ice. The melting points of polar substances are higher than the melting points of nonpolar substances with similar sizes. Molecular composition, force of attraction and the presence of impurities can all affect the melting point of substances.

A melting-point apparatus is a scientific instrument used to determine the melting point of a substance. Some types of melting-point apparatuses include the Thiele tube, Fisher-Johns apparatus, Gallenkamp (Electronic) melting-point apparatus and automatic melting-point apparatus.